Job did his MSc thesis on the 'spatial prediction of the availability of zinc for plant uptake'. For this, he used a prediction model based on soil data from IFDC, his own soil analyses, the QUEFTS model (nutrient uptake + growth) and, where possible, environmental covariates. His case study focused on Rwanda. He was supervised by Ellis Hoffland (Soil Quality, WUR) and Bas Kempen (ISRIC).